Question # 1

If focal length of objective and eye piece is 0.5 m and 10 cm respectively then magnifying power of telescope will be.

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0.5

5

10

20

Total confined light is obtained by

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Total internal reflection

Refraction of light

Diffraction

Polarization

The light emitted from light emitting diode has wave length.

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1.1 micro meter

1.3 micro meter

1.5 micro meter

1.7 micro meter

A layer over the central core of the jacke is called.

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Jacket

Plastic

Cladding

Rubber

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

Critical angle is that incident angle in denser medium for which angle of refraction is.

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0 ^o

45 ^o

90 ^o

120 ^o

The light signal in Opticla fiber must be regenerated by advice called.

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Regenerator

Generator

Repeater

Diode

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

The location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

Multimode step index fiber is useful for.

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Long distance

Sort distance

Very long distance

Infinite distance

The ability of reveal the minor details of an object under examination is called.

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Resolving power

Magnification

Scattering

Reflection

The final image formed by a simple microscope.

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Virtual and inverted

Real and erected

Virtual and erected

Real and inverted

The optical fiber is covered for protection by a

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Glass Jacket

Plastic Jacket

Copper Jacket

Aluminum Jacket

The magnification of a convex lens of focal length 5 cm is equal to.

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5

6

10

23

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

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